There are regularly scheduled helicopter services from Nice airport (NCE) to Monte Carlo heliport Terre-Plein de Fontvieille (MCM) which is just to the east of the casino. They run up until the evenings, with the last one, as I recall, leaving Nice airport around 2130. For community peace, there�s no service after 2200, including private helicopter services from the port.
I�m not certain where you�re staying but there�s also a heliport near the Negresco. When not at the harbour, I mix my stays between staying at the Hotel de Paris and the Negresco depending on my clients. Both are lovely, but both have their own unique personality. If you�re at the Negresco, the Chief Concierge, Jean Paul, can arrange a private helicopter with thirty minutes notice. (he�s done it for me several times.)
Scheduled services average circa �100 between key points. Travel times from NCE to MCM is under ten minutes.
Fr Bill